As we hurtle toward the 2020 election, some 15 states have joined the National Popular Vote Interstate Compact. They would use in a new way the constitutional system in which each state chooses in November electors to meet in December to decide who will be president. Had the compact been in effect in 2016, Hillary Clinton would have been president though 30 of the 50 states reckoned she was less fit for it. This is not an occasion for panic. The states that have joined the popular vot...